@Paul B - Pacing is a bigger-scale kind of timing. It's not just the little bits of action or dialogue in one shot as they relate to one another, it's the whole process of unravelling the plot and the action - what happens faster or slower, what part of the setup should be addressed soonest so as to grab the audience's attention quickly, how long it should take for the concluding events to take place versus the buildup to them, etc.

Basically, when most people talk about timing, they really mean pacing, because what they're talking about isn't minute or specific enough to truly be considered "timing" in the hyper-controlled cartoon sense.